Muscles open sooner
Warm tissue moves more willingly. In a heated room you reach your usable range earlier in the class, which means more of the session is spent doing the work instead of preparing for it.
The sweat is real. The 'detox' isn't
You will sweat a lot, and it feels excellent. But sweat is temperature regulation, not detoxification — your liver and kidneys handle that quietly and constantly. Anyone selling heat as a cleanse is selling you something.
It's a nervous-system reset
The most underrated effect is mental. Heat narrows your attention down to your breath and the next movement, which is about as close to enforced stillness as a Brickell schedule usually allows.
How to get through your first one
Hydrate before, not just during. Start near the back, where it's cooler. Sit down the moment you feel light-headed — resting is part of the practice, and every instructor would far rather you rest than push.
The short version
Use the heat to open, not to prove something.